# CVE-2026-70163: OpenSSH for Windows resource exhaustion denial of service

Source: https://junglewise.ai/threats/cve-2026-70163-allocation-of-resources-without-limits-or-throttling-in-openssh  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-70163 · Severity: high · CVSS 7.5 · Published 2026-10-13

OpenSSH for Windows is an SSH server implementation that allows remote access to Windows systems. An attacker can send specially crafted network requests that consume system resources without limits, causing the service to become unavailable and denying legitimate users access to affected systems.

Technologies: [Microsoft OpenSSH for Windows](https://junglewise.ai/threats/technologies/openssh-for-windows). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-70163 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70163 being exploited in the wild.

**How severe is CVE-2026-70163?** High severity, with a CVSS score of 7.5, published 13 October 2026.

**Which products and versions are affected?** Microsoft OpenSSH for Windows.

**Is there a fix for CVE-2026-70163?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-70163 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-70163?** Check whether you run Microsoft OpenSSH for Windows. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an allocation of resources without limits or throttling (CWE-770) in OpenSSH for Windows. It is triggered remotely over the network by an unauthorized attacker without requiring authentication. Successful exploitation results in denial of service by exhausting system resources.

## Affected products

- Microsoft OpenSSH for Windows

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70163](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70163)

## Related threats

- [OpenSSH for Windows double free privilege elevation](https://junglewise.ai/threats/cve-2026-97811-double-free-in-openssh-for-windows-allows-an-authorized-attacker)
- [OpenSSH for Windows path traversal code execution](https://junglewise.ai/threats/cve-2026-83923-relative-path-traversal-in-openssh-for-windows-allows-an)
- [OpenSSH for Windows use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-83769-use-after-free-in-openssh-for-windows-allows-an-authorized)
- [OpenSSH for Windows use-after-free vulnerability](https://junglewise.ai/threats/cve-2026-69397-openssh-for-windows-use-after-free-vulnerability)